Fountain pen



06a. 12, 1943. B. w. HANLE 2,331,606

FOUNTAIN PEN Filed May 14, 1942 INVENTOR D'lf/Q/YZZ/Z WHizn/e ATTORNEYSPatented Oct. 12, 1943 i FOUNTAIN PEN 1 Benjamin W. H anle, Elizabeth,.J.,' Ias s ig nor it 1 Eagle Pencil ware a plication-May 114, 1942,strait.442,8 6

Company, a corporation of Delam s. (o1. 120-47 1 1 The presentinvention-relates to fountain pens of the plunger or pistonfillertype.

As conducive to a clear understanding of the invention, itis noted thatwhere the piston rodof a "pen of the foregoing type is equipped with anelaborate stufling box or gland to inhibit leak:

age, the construction is inherently expensivaan'd', I I

therefore, not applicable to popularpric'ed pens; moreover, evenhigh-priced pens of this type are open to objection because-considerableforce mustbe applied to-operate thepiston; in view of=the resistanceimposed by the tightfitting stuffing box or gland, and as a consequenceof resultant wear the same becomes loos'e in time and leakage'develop's;

It is an object of the present inventionto providea' pen of the plungeror piston type, which may be easily manipulated and in which the and"complete effectiveness in operation as will appear hereinafter; Wherefelt is used the samemay be impregnated withwax or the like, to serve asalubricant in the plunger operation."

Over the inner exposed face of the piston there is" superposed a. washerof diameter somewhat smaller than thatof the piston and desirably madeof Celluloid or similar plastic. The

extremity of the reducedpiston rodend'I B is desirably upset as-at 2!over the-WasherZD to assemblethe piston to the piston rod.

Immediately beyond thepiston, the piston rod I! is provided with aunitary threaded'hub 22 ,Desirably, a small fibre washer 23 encirclesthe root of the reduced: end l8 and contacts the shoulder... definedbetween the" main length of I pistonrod'll. and its :reduced'end I8 atone face possibility of leakage is nevertheless effectively,

precluded throughoutthe life'of the penand sub-- stantially regardlessof wear of the moving parts.

Another object is to provide a plunger fillerof I the above type whichis adapted even 'to inexpensive pens, which dispenses withthe need forrubber or specialized piston material and which does notjnec'essitate' apen barrel of inordinately large diameter and great length for any given.volume of ink storing capacity.

In the accompanying drawing is shown one of various possible embodimentsof the several fea-,

general external appearance is conventional, in"- and the piston l9 atits other. The thread on the hub 22 co'acts with a thread 25' tappedinto the nipple l5.- Desirably, double or triplethreads are used forease and peed of operation.

In operation', theicap I6 is removed, theipiston rod'vll'is turned. torelease the hub 22 and then pushed inward to expelthe air from-thebarrel and f nally drawn upward with the pen point submerged in the inkbottle; -When' the threadedhub 22 reaches the barrel head l3, the pistonrod,

I I1 is turnedto thread the hub 22 into place as eluding as itdoes abarrel l0, a section II at the forward end thereof, a pen point l2 andan associated feed (not shown).

The head l3 of the barrel has a bore that defines an annular shoulder 14at the end of the barrel bore and presents a threaded nipple l5 uponwhich is removably threaded the cap l6 which houses the conventional.piston rod ll.

The piston rod has an inner end [8 of reduced diameter which extendsthrough an axial holein the piston l9. That piston may be of any of avariety of compressible materials such as textile fabric, rubber,sponge, cork or the like, but felt shown in Fig. 1. At the end of thethreading operation, the compressible piston l9 will be tightly throughthe reduced rod end l8 and pressure exerted thereby upon the washer 20,thereby to cause the piston I9 to expand peripherally into snugengagement with the barrelbore and to be forced at its inner faceagainst the annular shoulder [4 at the head of the barrel. As aconsequence, the piston snugly engages the barrel head and bore topreclude the possibility'of venting thereat and to maintain the ink inthe barrel against, the possibility of leakage therefrom.

In the compression of the piston any ink absorbed therein Will draintherefrom into the barrel about the periphery exposed beyond washer 20.In the compression of said piston the felt will not be forced into thetapped bore 25 of the nipple l5 since thisis prevented by the fiberwasher 23.

It will be seen that the piston when relieved of the compression in thehome position of Fig. 1 need not hug the pen barrel tightly, and in viewof the absence of stuffing boxes or glands, the

piston operates easily and without the needfor applying much force. Eventhough the piston is ordinarily P fe d by reason of i ow cost at has arelatively loose fit, the seal thereof in the compressed by tensiontransmitted claim as new and desire to secure by Letters- Patent of theUnited States is:

1. A fountain pen comprising a barrel, a com.

pressible piston, a piston rod carrying the same and means releasablylocking said rod to said barrel for axially compressing said piston andmaintaining it compressed in its outermost position, for peripheralexpansion thereof into snug engagement with the inner wall of thebarrel.

2; A fountain pen comprising a barrel, a compressible piston; a Dist-onrod carrying the same,

me nsfor locking the rod. its outermost Dos-i H011, and pistonvcompression means connected to:

said r d, locking means for peripherally expands sai piston. nder the,compression exerted thereon, snugly to en age the innenwall of; the

barrel. l 1 l 3. A fountain pen comprising a barreLa compressible pistontherein, a piston rod therefor, said rod having a thrfi ded hubadiaccntsaidpiston, said barrel having a tappedhead for accommodatingsaid thread d hub .in the outermost position of the pi ton. and meansconnected to. said hub and at the inner end =01 said piston rod forexerting axial compression upon said piston when said hub is threadedhome into. the end;- of

he barrel.

4. A fountain pen comprising a'rbarrel having:

a tapped head, a. compressible piston/in said barrel, a piston rod,having a. reducedendexe. tending axially through said piston, arelatively isid washer over the inner lace of said "piston, the innerend or the piston rod being upset over said washer. saidrodhavinc athreaded hubinear said piston for coaction. with the tapped head;

2,331,eoc

of said barrel for afiixing said piston in outermost position andconcurrently effecting axial compression and peripheral expansion ofsaid compressible piston.

5. A fountain pen comprising a barrel having a tapped head andpresenting an annular shoulder at the outer end of the bore thereof, acompressible piston, .a piston rod therefor having a reduced endextending axially through said piston, means aflixing the inner end ofsaid piston rod with respect to the inner face of said piston, andincluding a relatively rigid washer overlying the inner face of thepiston, a washer about the base of the reduced piston rod end andretained between the main length of the rod and the outer face of thepiston and of diameter substantially no greater than that of the piston,the length of piston rod adjacent to said washer comprising a threadedhub for coaction with the tapped head of the barrel, thereby to effectaxial compression and peripheral expansion of the compressible piston.

6. A.- fountain pen comprising a barrel havin a tapped he dand presnting an annular shoulder t the end-of the bore thereoi, a compressiblepiston, apiston-riod having a reduced end, a small fi er washe a outtheoot oi said end, said re-V duoed end, extruding axially through saidpiston, a washer lot iame er smaller than that of said piston uperposedover the inner face thereof and about said reducedend, the latter havingmeans at its extremity to maintain the parts in position substantiallythat of said rocl, a compressible; pistonemcirclingsaid reduced rodend,awasher,

of plastic material encircling the outer, end of said rod end,-.thelatter being upset oversaid washer, the endof said rod immediatelybeyond said piston comprising a threaded hub.,

BENJAMIN ow. HANLE.

